https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91403
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Doesn't ICE for me, but SLP during vectorization goes wild, for very short
*.ifcvt
<bb 2> [local count: 12199019]:
b_lsm.4_24 = b;
<bb 3> [local count: 97603136]:
# d_69 = PHI <2(2), d_9(5)>
# b_lsm.4_17 = PHI <b_lsm.4_24(2), _79(5)>
# ivtmp_76 = PHI <8(2), ivtmp_73(5)>
_14 = a[d_69][5];
_16 = _14 + b_lsm.4_17;
_23 = _14 + _16;
_30 = _14 + _23;
_37 = _14 + _30;
_44 = _14 + _37;
_51 = _14 + _44;
_58 = _14 + _51;
_65 = _14 + _58;
_72 = _14 + _65;
_79 = _14 + _72;
d_9 = d_69 + 1;
ivtmp_73 = ivtmp_76 - 1;
if (ivtmp_73 != 0)
goto <bb 5>; [87.50%]
else
goto <bb 4>; [12.50%]
<bb 5> [local count: 85404116]:
goto <bb 3>; [100.00%]
<bb 4> [local count: 12199019]:
# _80 = PHI <_79(3)>
b = _80;
return;
it creates a *.vect dump with 1860297 lines, with:
vect__14.10_5 = MEM <vector(8) int> [(int *)vectp_a.8_7];
vectp_a.8_4 = vectp_a.8_7 + 32;
vect__14.11_3 = MEM <vector(8) int> [(int *)vectp_a.8_4];
vectp_a.8_2 = vectp_a.8_4 + 32;
vect__14.12_1 = MEM <vector(8) int> [(int *)vectp_a.8_2];
vectp_a.8_10 = vectp_a.8_2 + 32;
vect__14.13_15 = MEM <vector(8) int> [(int *)vectp_a.8_10];
vectp_a.8_31 = vectp_a.8_10 + 32;
...
where there are 620046 those MEM loads that nothing consumes and 620046
additions of 32.
